Oil & Gas
| Wed 12 Feb 2025
Beijing, Feb. 13 -- China National Petroleum and CNPC Greatwall Drilling have obtained a patent for drilling tool angle difference measuring tool. This invention was developed by Zhang Dongji, Li Xiaojun, Song Changhe, Dong Ning, Qiu Zhaoyang, Ma Long, Zhang Hepeng, Zan Jingyu, Qiao Jianguo, Wang Xin, Zhan Jie and Yang Sheng.
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